42521365 has 8 divisors (see below), whose sum is σ = 53244288. Its totient is φ = 32538000.

The previous prime is 42521357. The next prime is 42521371. The reversal of 42521365 is 56312524.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42521365 - 2³ = 42521357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184761 + ... + 184990.

It is an arithmetic number, because the mean of its divisors is an integer number (6655536).

Almost surely, 2^42521365 is an apocalyptic number.

It is an amenable number.

42521365 is a deficient number, since it is larger than the sum of its proper divisors (10722923).

42521365 is a wasteful number, since it uses less digits than its factorization.

42521365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369779.

The product of its digits is 7200, while the sum is 28.

The square root of 42521365 is about 6520.8408200170. The cubic root of 42521365 is about 349.0350700794.

Adding to 42521365 its reverse (56312524), we get a palindrome (98833889).

The spelling of 42521365 in words is "forty-two million, five hundred twenty-one thousand, three hundred sixty-five".